Improvement in machines for making metal screws



8 She1s--8heet I. I N. c. HUBBELL; "Machines for Making Metal Screws;

Patenteld Oct. 7

I V 8Sheets--Sheet3. N. c. HUBBEL'L. Machines for Making Metal Screws.

Pa tented Oct. 7,1873.

E ii

8 Sheets- Shee t4 N. G. HUBBELL.

Machines for Making Metal Screws. N0. 143,412. Patented 0ct.7,1873.

w inesses 8 Sheets--8heet 5.

N. C. HUBBELL. v Machines for Making Metal Screws. NO. 143,412.

Patented 0m. 7, 1878.

8Sheets--Sheet6. N. G. HUBBELL.

Machines for Making Metal Screws. "NO. 143,412. Patented Oct. 7,1873

N. C. HHBBELL. Machines for Making Metal Screws. N0.143,412. LPatented0ct.7,l8 73.

8 Sheets--Sheet 7,

8 Sheets--S hee t 8.

N. c. HUB BELL. Machines far Making Meta? Screws.

Paten %ed()ct. 7,1873

- half of the machine.

UNITED 1f .n'rnnr @Frrcn NAPOLEON C. -HUBBELL, OF HARTFORD, CONNECTICUT,ASSIGNOR TO JOHN JOHNSON AND AMOS WHITNEY, OF SAME PLACE, AND ANDRUSCORBAN,

OF PLAINVILLE, CONNECTICUT.

IMPROVEMENTIN MACHINES FOR MAKING METAL SCREWS.

Specification forming part of Letters Patent No. 143,412, dated October7, 1873 application filed August 2, 1873.

To all whom it may concern:

Be it known that I, NAPOLEON G. HU'BBELL, of Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Machines for Making Screws, of which the following is aspecification, reference being had to the accompanying drawings, inwhich Figure 1 is a front elevation of the machine embodying saidimprovements. Fig. 2 is a top view of the same. Fig. 3 is a detachedview, showing the rotating arrangement of the revolving head andpulloff. Fig. 4 is a detached front view of the pulloff, which controlsand prevents the rotation of the die-holders up to a certain point, andthen releases them and allows them to rotate. Fig. 5 is an end view ofthe end A of the said pull-off. Fig. 6 is an enlarged side elevation ofabout one-half of the machine--the half at the left. Fig. 7 is anenlarged side elevation of the other and right Fig. Sis an enlarged topview of the parts shown in Fig. 6. Fig. 9 is an enlarged top view of theparts shown in Fig. 7. Fig. 10 is a view of the revolving head incentral cross-section. Fig. 11 is a detached view of the back side ofthe revolving head. Fig. 12 is a front view of the standard hereinafterreferred to, with the parts in front of it removed. Fig. 13 is adetached view of the back side of the sliding plate b hereinafterreferred to.

This machine is. designed more especially for making machine, milled,and set screws. off the end of a piece of 'wire or. roinid rod of thediameter of the head of the screw, the body of the screw being first cutdown to the right diameter; the thread then cut; the screw then severedfrom the rod, leaving a head thereon of the diameter of the rod; theslot in the head of the screw, when one is needed, then cut, and,finally, the screw delivered from the machine. The parts and combinationof parts in which the invention consists will be particularly specifiedin the claims forming a part of this specification, and nothing hereindescribed which is not so specified is claimed as the present invention.

The letter a indicates the metallic wire or rod to be worked up intoscrews, rimning through the hollow shaft of the pulley a on the end ofwhich shaft is the chuck a which is opened and closed by means of thelever (0 and by the movement of the same lever the rod 0. is fed inwardin the direction indicated by the overlying arrow. 7

This mechanism forms the subject-matter of Letters Patent of the UnitedStatesNo.118,4.81, dated August 29, 1871, and granted to E. G.Parkhurst; and to it I make no claim.

The letter 1) indicates a revolving head, having a rotary step-by-stepmotion, as will be hereinafter explained; from it project, among otherthings, the two measuring-stops 12 N. The first step in making a screwis to rotate the head I) so that a stop, b points straight toward thechuck ta The rod 0. is then moved up so as to strike the end of thestop, which leaves enough of the rod projecting from the mouth of thechuck to form a screw. The head I) is hung upon the reciprocating plate71 which moves in ways on the standard 0'.

The plate 11 is moved back and forth by the lever b Theinward movementofthe plate b is stopped at any desired point by the adjusting-screw bwhich is carried on the plate and strikes against the end of thestandard 11 When the plate is drawn back the head b rotates, by meanshereinafter described, one step. This brings one of the box-tools, socalled, b, into position to operate on the end of the rod a. Thisbox-tool is simply a lathe or sta tionary milling-tool for cutting downthe body of the rod to the proper diameter of the screw to be made. Allthis while the rod or is revolving, with the cone-pulley 0. toward theoperator, and when the plate I) and head I) are again moved inward thebox-tool cuts away the body of the rod to the desired diameter andlength. The plate b and head I; are now drawn back again, therebyrotating the head another step, and bringin g one of the die-holders b",holding screw-cutting dies, into position for operating on the screw tobe made. On moving the slide b inward again this screwa cutting toolcuts a thread on the body of the screw.

I will describe the construction and operation of the two revolvingdie-holders here. These die-holders (see Fig. 3) are on the ends of theshafts I), which are set into and revolve in the head I), being held inplace by shoes fitting on the screws 0. There are small bevelgears 0upon the inner ends of the shafts b", meshing into a bevel-gear, 0 sothat if either die-holder rotates the other one must rotate in theopposite direction. When a die holder is moved up to out a screw-threadon the end of the rod (0, the die-holder is held from rotating by thatsquare collar 0 which is on the opposite or rear die-holder, bearingagainst the flat surface of the pull-01f 0 Just at the point when thedesired length of screw-thread has been cut, the square collar 0 in therear slips past or by the pull-off c and then the die-holders commenceto rotate with the rod a, such rotation being caused by the friction ofthe rod and the operating-dies, the rear dieholder rotating in anopposite direction from the operating die-holder. The thread being cut,the cuttingoif tool 0 set in the tool-stock b and operated by the lever0 is brought forward so as to cut off the screw from the rod a, leavinga head on the screw of the same size as the rod to. The head of thescrew is now to have the customary slot milled or cut into it. The headI) is now rotated another step, bringing the other stop 11 intoposition, when the rod a is again moved inward preparatory to cuttinganother screw. As the head I) rotates this last step, the square collar0 on the die-holder, which has just operated, and which now holds ascrew in its grasp, strikes on the locking-guard c", and holds thisdie-holder from rotating again until the pull-off is reached. The headI) is now rotated another step, and the other of the box-tools b isbrought into position for operation. At the same time the head of thescrew which is in the die-holder is carried across the rotatingnieking-tool c and a slot cut in the head of the screw. The head I) isnow rotated another step, a full quarter-turn, and the head of the screwis brought up into position to be removed from the die-holder, (whilethe opposite die-holder has come into position to out another thread.)

The screw is removed from the die-holder by the aid of thescrew-removing device, which I will now explain.

The letter d indicates a rod himg and having longitudinal, but notrotary, motion in the bearings d d which project from the plate D Thelongitudinal motion of this rod is defined and limited at pleasure bymeans of the clampstops d d on the rod between the bearings d In the endof the rod 01 is a screw-driver blade, d always vertical in position, sothat,

as the die-holder carrying a screw comes around to this side, thescrew-driver blade will strike into the slot in the head of the screw,and when the die-holder, released from the pull-off, commences torotate, the screw in the grasp of the dies, being held from rotating bymeans of the screw-driver blade, is thereby run out from the dies anddrops into a receptacle beneath. The rod (1 is jointed, by means of thearm (I and connecting-rod 01 to the weighted lever d As the screw runsout from the die-holder it pushes back the weighted lever d When thislever gets back past a vertical position, it falls by its own weight tothe other side, and thus suddenly pulls back the screw-driver blade,leaving the screw free to fall. The rod dis moved inward again by thepin al projecting downward from the arm 61, which, as the plate 1) movesinward, strikes upon the pin d on the arm 11* screwed to the standardI).

I will now more particularly explain how the pull-off c is operated.This pull-off is set upon, and in the main moves with, the plate b Ithas, however, a short longitudinal and independent motion of its own. Itis attached by the screws 6 e and e to the plate b the pillars or bodiesof these screws running through slots 0 e e. The screw c has a spring,0, under its head bearing on the pull-off, so as to prevent accidentalmotion of the pull-off. end wing of the pull-oft just comes to andcoincides with the end of the locking-guard 0 when the pull-off is set,so to speak, so that a square collar, 0 passes directly from thelocking-guard to the end wing of the pull-ofl, still holding thedie-holder from turning. Just above the plate b there is pivoted to theend of the adjusting-screw 0 running through the arm 6 projecting fromthe standard If an arm, 6, its ilmer and free end resting by its weighton the periphery of the head I). This arm a has a stop, 0', againstwhich, at the proper time, a pin, e projecting from the pull-01f,strikes as the plate Z; moves inward, and thus stops the inward movementof the pull-off, so as to release the square collar on the dieholder,and thus permit the two die-holders to rotate.

In order that the pull-off may not be'thus stopped every time that theplate I) moves inward, the head b is furnished with pins 0 s set uponthe periphery of the head I) as to strike against and so raise the endof the lever-arm e that the pin 6 cannot hit the stop 0 The pins 0 areomitted at those places on the head I) when the lever-arm a should beleft down. The pull-off is again pushed into set, when the plate 1)moves outward, by a pin, 0, on the back side of the pull-01f, strikingagainst a pin (not seen in drawings) on the inside of the standard b Iwill now describe the arrangement for giving the rotary step-by-stepmotion to the head I). When this head rotates so as to bring one of thedie-holders If into position for opera- The tion, the head makes a fullquarter-turn; but

when the head rotates so as to bring either a measuring-stop, N, or abox-tool, 11 into line with the chuck a the head makes but aneighth-turn, so that in making one complete revolution the head makestwo quarter-turns and four eighth-turns, the quarter-turns separatedfrom each other by two intervening one-eighth turns. On the back side ofthe head I) is a raised annular collar, f, having eight equidistantstop-notches, This annular collar fits into and turns in a correspondingannular groove in the slide 1). The head 12 has a shaft, f runningthrough the slide 12 and on the rear end of this shaft is a round disk,f fitting into and turning in a corresponding socket in the back side ofthe slide b The head I) is fastened to the disk f by the screws f. Adog, f lies in a vertical slot in the standard 11 pressed down by aspring, f its lower end resting on the collar f, so that as opportimityoffers this dog shuts down into the notches f and thus stops and holdsthe head I) at desired points. The head is rotated by means of the pawlf pressed down by a spring, striking into the toothed ratchet-wheel fwhen the slide 1) moves outward. The dog is raised out of a notchpreparatory to the action of the pawl and ratchet by the cam i, pivotedat its outer end to the standard If, and pressed down by a spring. Thepin 11, projecting from the rear side of the dog, rides and rises onthis cam as the slide 12 moves outward, thus raising the dog out of anotch. When the head b has made an eighth-turn the pin 43 drops off theshoulder i of the cam i, and the dog shuts down into a notch. The pin 1'moves inward with the slide 11 passing under the cam i, the under sideof which is hollowed out, this cam i lifting up to allow the pin to passunder the point of the cam. But there are two points in the revolutionof the head I) where a quarter-turn, instead of an eighth -turn, isrequired, and this is accomplished by means of the sliding cam i whichis on the end of the rod 1'", which slides in bearings 03 i and has thepin-stop i and the clamp-stop i On thecam-rod i and between the twostops 01 and 1;, is an actuatingslide, 6 moving back and forth with thelever b. Every time that the slide 11 is moved inward till stopped bythe screw b the slide i strikes the clamp i and the sliding cam 2' movesinward so as to abut against the shoulder of the cam 13, and soprotracts the outward ride of the pin 13 that the dog passes over one ofthe eighth-turn notches, and thus permits the head b to make a fullquarter-turn. After the pin 2' has ridden outwardly so far that the doghas passed one of the eighth-turn notches, and has passed upon thesliding cam 6 the slide 1' strikes the pin '5 and moves the sliding camoutward so as to leave an opening between the two cams. When the dogarrives at the second of the eighth-turn notches, and so that the head12 has made a full quarter-turn, the dog strikes into the notch, and thepin 1' returns to the end of its inward play, under the two cams. Thenext two movements of the head I) are eighth-turns, and the sliding cam01 is prevented from moving in to abut against the stationary cam asfollows: There is a stop, 6 already referred to, on the lever-arm aacting in conjunction with the pin 0 to operate the pull-01f. Theseparts have another office in connection with the sliding cam. When thehead I) is to make a quarter-turn the pins 6 on the head I) lift thelever-arm 6 so that the pin 6 will not strike the stop 6, and so thatthe slide 1)" moves inward till stopped by the screw b but when the headI) is to make but an eighth-turn the arm 0 lies upon the head b, so thatthe pin 6 strikes the stop 6, and the slide b is thus prevented frommoving farther in, and the gap between the two cams is not closed. 7

When square-headed set-screws are made by this machine the screws aremade off the end of a square rod. The slotting-tool c is dis pensed withif the heads are to have no slot; and in the place of the screwdriverblade 61 I use the forked tool shown in Fig. 14 to embrace the squarehead.

I claim as my invention- 1. The combination of the revolving head I) andthe two rotating die-holders b b", so geared together that when theyrotate such rotation is in opposite directions, all substantially asdescribed, and for the purposes set forth.

2. The combination of the revolving head I), the two contrarily-rotatingdie-holders If N, equipped with the square collars c 0 and thelocking-guard c, all constructed, arranged, and designed for operationand use, substantially as described.

3. The combination of the revolving head b, the two contrarily-rotatingdie-holders b b equipped with the square collars 0 c and the pull-01f c,the whole constructed, arranged, and designed for operation and use,substantially as described.

4. The combination of the revolving head I), the two contrarily-rotatingdie-holders b 11 the longitudinally-reciproeating screw-driver rod d,the weighted lever (1 and the screw-driver blade d the whole arranged,constructed, and designed for operation and use, substantially asdescribed. I 5. The combination of the longitudinally-reciprocatingslide b the head I) provided with the notched collar f, the dog f andthe cam 15, the whole constructed, arranged, and designed for operationand use, substantially as described.

6. The combination of the sliding plate b the head 11 provided with thenotched collar f, the ratchet and pawl f f, the dog f, the stationarycam i, and the sliding cam i the whole constructed, arranged, anddesigned for operation and use substantially as described.

7. The combination-0f the sliding plate b the adjusting-screw b thestandard If, the stationary earn 6, the sliding cam i with its cam-rodand actuating-lever, the lever-arm e,

and the head I), provided with the pins 0 the Whole constructed,arranged; and designed for operation and use substantially as de 1scribed.

8. The combination of the sliding plate b vided'with the stop 0 andthehead I), equipped With the pins 0 the Whole constructed; ar-

ranged and designed for operation and use substantially as described;

NAPOLEON" Oi HUBBELL. Witnesses:

WM; E. SIMoNDs, O; M. SPENCER.

